Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ] 
  1 /*
  2  * arch/arm/mach-ixp4xx/gtwx5715-setup.c
  3  *
  4  * Gemtek GTWX5715 (Linksys WRV54G) board setup
  5  *
  6  * Copyright (C) 2004 George T. Joseph
  7  * Derived from Coyote
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License
 11  * as published by the Free Software Foundation; either version 2
 12  * of the License, or (at your option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  * GNU General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 22  *
 23  */
 24 
 25 #include <linux/init.h>
 26 #include <linux/device.h>
 27 #include <linux/serial.h>
 28 #include <linux/tty.h>
 29 #include <linux/serial_8250.h>
 30 #include <linux/slab.h>
 31 
 32 #include <asm/types.h>
 33 #include <asm/setup.h>
 34 #include <asm/memory.h>
 35 #include <asm/hardware.h>
 36 #include <asm/irq.h>
 37 #include <asm/mach-types.h>
 38 #include <asm/mach/arch.h>
 39 #include <asm/mach/flash.h>
 40 #include <asm/arch/gtwx5715.h>
 41 
 42 /*
 43  * Xscale UART registers are 32 bits wide with only the least
 44  * significant 8 bits having any meaning.  From a configuration
 45  * perspective, this means 2 things...
 46  *
 47  *   Setting .regshift = 2 so that the standard 16550 registers
 48  *   line up on every 4th byte.
 49  *
 50  *   Shifting the register start virtual address +3 bytes when
 51  *   compiled big-endian.  Since register writes are done on a
 52  *   single byte basis, if the shift isn't done the driver will
 53  *   write the value into the most significant byte of the register,
 54  *   which is ignored, instead of the least significant.
 55  */
 56 
 57 #ifdef  __ARMEB__
 58 #define REG_OFFSET      3
 59 #else
 60 #define REG_OFFSET      0
 61 #endif
 62 
 63 /*
 64  * Only the second or "console" uart is connected on the gtwx5715.
 65  */
 66 
 67 static struct resource gtwx5715_uart_resources[] = {
 68         {
 69                 .start  = IXP4XX_UART2_BASE_PHYS,
 70                 .end    = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 71                 .flags  = IORESOURCE_MEM,
 72         },
 73         {
 74                 .start  = IRQ_IXP4XX_UART2,
 75                 .end    = IRQ_IXP4XX_UART2,
 76                 .flags  = IORESOURCE_IRQ,
 77         },
 78         { },
 79 };
 80 
 81 
 82 static struct plat_serial8250_port gtwx5715_uart_platform_data[] = {
 83         {
 84         .mapbase        = IXP4XX_UART2_BASE_PHYS,
 85         .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 86         .irq            = IRQ_IXP4XX_UART2,
 87         .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
 88         .iotype         = UPIO_MEM,
 89         .regshift       = 2,
 90         .uartclk        = IXP4XX_UART_XTAL,
 91         },
 92         { },
 93 };
 94 
 95 static struct platform_device gtwx5715_uart_device = {
 96         .name           = "serial8250",
 97         .id             = PLAT8250_DEV_PLATFORM,
 98         .dev                    = {
 99                 .platform_data  = gtwx5715_uart_platform_data,
100         },
101         .num_resources  = 2,
102         .resource       = gtwx5715_uart_resources,
103 };
104 
105 static struct flash_platform_data gtwx5715_flash_data = {
106         .map_name       = "cfi_probe",
107         .width          = 2,
108 };
109 
110 static struct resource gtwx5715_flash_resource = {
111         .flags          = IORESOURCE_MEM,
112 };
113 
114 static struct platform_device gtwx5715_flash = {
115         .name           = "IXP4XX-Flash",
116         .id             = 0,
117         .dev            = {
118                 .platform_data = &gtwx5715_flash_data,
119         },
120         .num_resources  = 1,
121         .resource       = &gtwx5715_flash_resource,
122 };
123 
124 static struct platform_device *gtwx5715_devices[] __initdata = {
125         &gtwx5715_uart_device,
126         &gtwx5715_flash,
127 };
128 
129 static void __init gtwx5715_init(void)
130 {
131         ixp4xx_sys_init();
132 
133         gtwx5715_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
134         gtwx5715_flash_resource.end = IXP4XX_EXP_BUS_BASE(0) + SZ_8M - 1;
135 
136         platform_add_devices(gtwx5715_devices, ARRAY_SIZE(gtwx5715_devices));
137 }
138 
139 
140 MACHINE_START(GTWX5715, "Gemtek GTWX5715 (Linksys WRV54G)")
141         /* Maintainer: George Joseph */
142         .phys_io        = IXP4XX_UART2_BASE_PHYS,
143         .io_pg_offst    = ((IXP4XX_UART2_BASE_VIRT) >> 18) & 0xfffc,
144         .map_io         = ixp4xx_map_io,
145         .init_irq       = ixp4xx_init_irq,
146         .timer          = &ixp4xx_timer,
147         .boot_params    = 0x0100,
148         .init_machine   = gtwx5715_init,
149 MACHINE_END
150 
151 
152
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